x86/hyperv: Dispatch redirected proxy interrupts

Once a redirected proxy interrupt has been configured, the IOMMU at the
host will post it directly to a hardware vector in the VTL2 guest.
Calculate the index of the proxy interrupt based on the hardware interrupt
vector and indicate that it needs to be asserted.

Signed-off-by: Ricardo Neri <[email protected]>

Author: ricardon

arch/x86/kernel/cpu/mshyperv.c

@@ -177,6 +177,31 @@ static DEFINE_RAW_SPINLOCK(redirected_proxy_intr_lock);
 
 DEFINE_IDTENTRY_IRQ(hv_vtl_redirected_interrupt)
 {
+	unsigned long flags;
+	u32 proxy_intr;
+
+	if (!hv_redirected_proxy_intr_handler) {
+		pr_err_ratelimited("redirected intr handler not defined. hw intr %u not handled\n", vector);
+		goto out;
+	}
+
+	if (vector < FIRST_HV_VTL_REDIRECTED_VECTOR || vector > FIRST_SYSTEM_VECTOR) {
+		pr_err_ratelimited("redirected hw vector %u is invalid\n", vector);
+		goto out;
+	}
+
+	raw_spin_lock_irqsave(&redirected_proxy_intr_lock, flags);
+	proxy_intr = redirected_proxy_intr[vector - FIRST_HV_VTL_REDIRECTED_VECTOR];
+	raw_spin_unlock_irqrestore(&redirected_proxy_intr_lock, flags);
+
+	if (proxy_intr == REDIRECTED_VECTOR_UNDEF) {
+		pr_err_ratelimited("hw vector %u not redictected to proxy interrupt\n", vector);
+		goto out;
+	}
+
+	hv_redirected_proxy_intr_handler(proxy_intr);
+
+out:
 	apic_eoi();
 }
 #endif